碳包覆Fe3O4纳米负极材料的制备及电化学性能

摘要

以Fe(NO3)3·9 H2O作为铁源、无水葡萄糖为碳源,利用水热法及高温煅烧法制备碳包覆Fe3O4纳米颗粒.通过控制不同C/Fe摩尔比,探究其对材料形貌结构及电化学性能的影响.研究表明:当C/Fe摩尔比为10时,碳包覆Fe3O4纳米颗粒具有完整的碳包覆结构且分散程度好、粒径均一,具有最优的电化学性能;在100 mA/g的恒定电流密度下循环100次后,可逆比容量为741.5 mAh/g,容量保持率可达65.9％.%The carbon coated Fe3O4 nanocomposites were fabricated by using hydrothermal reaction of Fe (NO3)3· 9 H2O and glucose followed by thermal annealing. The influence of different C/Fe mole ratio on the morphology and electrochemical properties for the materials were studied. The researches show that when the C/Fe molar ratio of 10, the carbon coated Fe3O4 nanoparticles have integrated carbon coating structure, good dispersion and uniform size distribution with the best electrochemical performance. When used as the anode materials for the lithium-ion batteries, the reversible specific capacity is achieved to 741.5 mAh/g at current density of 100 mA/g even after 100 cycles, and the capacity retention rate can reach 65.9％ as well.